namespace Components {
    export class Header {
      constructor() {
        const elem = document.createElement("div");
        elem.innerText = "This is Header";
        document.body.appendChild(elem);
      }
    }
  
    export class Content {
      constructor() {
        const elem = document.createElement("div");
        elem.innerText = "This is Content";
        document.body.appendChild(elem);
      }
    }
  
    export class Footer {
      constructor() {
        const elem = document.createElement("div");
        elem.innerText = "This is Footer";
        document.body.appendChild(elem);
      }
    }

    
  }